Brazil is one of the most dangerous places in the world to be an activist, according to a report by Global Witness. In the past ten years, hundreds of environmental activists who have spoken out against pollution and overuse of Brazil’s natural resources have been attacked or killed.Brazil is one of the most dangerous places in the world to be an activist, according to a report by Global Witness. In the past ten years, hundreds of environmental activists who have spoken out against pollution and overuse of Brazil’s natural resources have been attacked or killed.